Preferential growth of long ZnO nanowires and its application in gas sensor
Preferential growth of long ZnO nanowires and its application in gas sensor
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长ZnO纳米线的优先生长及其在气体传感器中的应用
DOI：
10.1016/j.snb.2012.11.044
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发表时间：
2013-02-01
影响因子：
8.4
通讯作者：
Liu, Jinhuai
中科院分区：
文献类型：
--
作者：
Gu, Cuiping;Li Shanshan;Liu, Jinhuai
采用Zn（NO3）2中心点6 H（2）O水溶液和NaOH水溶液的突然水热反应，合成了平均直径为50 nm，长度达9 μ m的长单晶ZnO纳米线。详细研究了ZnO长纳米线的形成机理。此外，采用湿化学还原法在ZnO纳米线表面引入了Au纳米粒子。将长ZnO纳米线和Au纳米颗粒功能化的ZnO纳米线（Au NPs-ZnO纳米线）用于制备气敏传感器，对有机气体进行检测。所制备的气体传感器具有高的气敏响应，和短的响应和恢复时间。与ZnO纳米线相比，Au NPs-ZnO纳米线对乙醇、正丁醇等有机蒸气具有更高的响应性和更低的工作温度。这种行为可以归因于Au纳米颗粒的催化活性和Au/ZnO界面处的肖特基接触。(c)2012爱思唯尔有限公司版权所有。
Long single crystalline ZnO nanowires with an average diameter of 50 nm and lengths of up to 9 mu m were synthesized by a sudden hydrothermal reaction of Zn(NO3)(2)center dot 6H(2)O aqueous solution and NaOH aqueous solution. The formation mechanism of the long ZnO nanowires was studied in detail. In addition, Au nanoparticles were introduced on the surface of ZnO nanowires using a wet-chemical reduction method. Both the long ZnO nanowires and Au-nanoparticle-functionalized ZnO nanowires (Au NPs-ZnO NWs) were applied to fabricate gas sensors for the detection of some organic vapors. The as-fabricated gas sensors exhibit high gas-sensing response, and short response and recovery time. Compared with the ZnO nanowires, the Au NPs-ZnO NWs exhibit a higher response and lower working temperature to some organic vapors, such as ethanol and n-butanol. Such behaviors can be attributed to catalytic activity of Au nanoparticles and Schottky contact at the Au/ZnO interface. (c) 2012 Elsevier B.V. All rights reserved.